458 Scientific Proceedings, Royal Dublin Society. 
The NeorropicaL Reeion possesses eight of the twenty-four 
genera of this sub-family ; only three of these are peculiar, but 
one other enters no other region save the Sonoran. In the 
Sonoran Recion four genera occur (neglecting Holarctic incur- 
sors), one only of which is peculiar. The Horarcric Rzcion has 
eight A%schnine genera. Three only are confined to the region, 
but two others (Basieschna and Fonscolombia), which enter the 
northern Sonoran, may be reckoned with these. The Erutopran 
Recon possesses but four genera, one of which is peculiar. In 
the MascarENE Reocion the sub-family is represented by three 
species of the almost cosmopolitan Anaz, and two of the wide- 
spread Acanthagyna. In the Orrenrat Rucion, eight genera 
are found. ‘Three of these (Olgowschna, Cephaleschna, and 
Tetracanthagyna) are peculiar, and one other (Amphiceschna) which 
transgresses into the Austro-Malayan sub-region may be reckoned 
with them. Nine genera (excluding this just mentioned) inhabit 
the AusTRALIAN Recion; only three (all Australian) are confined 
toit. There appear to be no Aischnine dragonflies in New Zealand. 
Of the wide-ranging genera, Anaw is nearly cosmopolitan, but 
appears to be absent from Australia and New Zealand. Hemianazx 
has a very curious range—one South Huropean, and one Australian 
species. schna is spread over the whole of the Neotropical and 
Holaretic Regions, but is almost unknown in the tropics of the 
eastern hemisphere; there is one (doubtful) species in India, one in 
Australia, and two in the mountains of Hast Africa. Gynacantha 
has an interesting discontinuous range in the tropics, occurring in 
the Neotropical and Austro-Malayan Regions, while Acanthagyna 
is more widely spread, being found in the Neotropical Region (where 
it is almost confined to the Brazilian and West Indian sub-regions) 
in West Africa, and in the Indo-Malayan district of the Oriental 
Region, some of the species extending thence into Papua. A sur- 
prising fact is that, with such a range, the genus has not been found in 
Madagascar, but Mauritius and the Seychelles have a species each. 
Fossil Adschninee appear to be less plentiful than fossil Gom- 
phine. A single Anawz is recorded from the Oligocene of Rado- 
boj, Croatia ; and there are several extinct dragonflies referred 
to dischna, the oldest of which is from the Lias. A species has 
been found in Cretaceous rocks in Queensland. This fact seems to 
indicate that the scattered range of the few species of the genus now 
found in the old-world tropics is due to its almost total extinction 
over those regions, though in Kurope and America it appears to be 
fully holding its own in spite of its comparatively high antiquity. 
